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EP1557967A1 - Verfahren zur HARQ-Wiederholungszeitsteuerung - Google Patents

Verfahren zur HARQ-Wiederholungszeitsteuerung Download PDF

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Publication number
EP1557967A1
EP1557967A1 EP04001395A EP04001395A EP1557967A1 EP 1557967 A1 EP1557967 A1 EP 1557967A1 EP 04001395 A EP04001395 A EP 04001395A EP 04001395 A EP04001395 A EP 04001395A EP 1557967 A1 EP1557967 A1 EP 1557967A1
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EP
European Patent Office
Prior art keywords
data packet
feedback message
transmitting
received
nack
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04001395A
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English (en)
French (fr)
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EP1557967B1 (de
Inventor
Joachim Löhr
Eiko Seidel
Dragan Petrovic
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Panasonic Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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Publication date
Priority to DE602004012702T priority Critical patent/DE602004012702T2/de
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to AT04001395T priority patent/ATE390773T1/de
Priority to EP04001395A priority patent/EP1557967B1/de
Priority to KR1020067016817A priority patent/KR20070006748A/ko
Priority to CNA2005800069148A priority patent/CN1926795A/zh
Priority to PCT/EP2005/000145 priority patent/WO2005071875A1/en
Priority to US10/586,736 priority patent/US20070183451A1/en
Priority to MXPA06008357A priority patent/MXPA06008357A/es
Priority to JP2006549957A priority patent/JP2007523529A/ja
Publication of EP1557967A1 publication Critical patent/EP1557967A1/de
Priority to JP2006348524A priority patent/JP2007166642A/ja
Application granted granted Critical
Publication of EP1557967B1 publication Critical patent/EP1557967B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
    • H04L1/1678—Details of the supervisory signal the supervisory signal being transmitted together with control information where the control information is for timing, e.g. time stamps
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes

Definitions

  • the present invention relates to method for controlling the transmission timing of data retransmissions in a wireless communication system wherein a HARQ retransmission protocol, is used to retransmit data from a transmitting entity to a receiving entity via a data channel. Further the present invention relates to a base station, a mobile terminal and a communication system employing the present invention.
  • W-CDMA Wideband Code Division Multiple Access
  • IMT-2000 International Mobile Communication
  • 3GPP 3 rd Generation Partnership Project
  • the dedicated channel (DCH) for downlink and uplink and the downlink shared channel (DSCH) have been defined in Release 99 and Release 4.
  • the developers recognized that for providing multimedia services - or data services in general - high speed asymmetric access had to be implemented.
  • the high-speed downlink packet access (HSDPA) was introduced.
  • the new high-speed downlink shared channel (HS-DSCH) provides downlink high-speed access to the user from the UMTS Radio Access Network (RAN) to the communication terminals, called user equipments in the UMTS specifications.
  • RAN UMTS Radio Access Network
  • ARQ Automatic Repeat reQuest
  • FEC Forward Error Correction
  • SAW stop-and-wait
  • SR selective-repeat
  • a data unit will be encoded before transmission. Depending on the bits that are retransmitted three different types of ARQ may be defined.
  • HARQ Type I the erroneous data packets received, also called PDUs (Packet Data Unit) are discarded and new copy of that PDU is retransmitted and decoded separately. There is no combining of earlier and later versions of that PDU.
  • PDUs Packet Data Unit
  • HARQ Type II the erroneous PDU that needs to be retransmitted is not discarded, but is combined with some incremental redundancy bits provided by the transmitter for subsequent decoding. Retransmitted PDU sometimes have higher coding rates and are combined at the receiver with the stored values. That means that only little redundancy is added in each retransmission.
  • HARQ Type III is almost the same packet retransmission scheme as Type II and only differs in that every retransmitted PDU is self-decodable. This implies that the PDU is decodable without the combination with previous PDUs. In case some PDUs are heavily damaged such that almost no information is reusable self decodable packets can be advantageously used.
  • the retransmission packets carry identical symbols.
  • the multiple received packets are combined either by a symbol-by-symbol or by a bit-by-bit basis (see D. Chase: "Code combining: A maximum-likelihood decoding approach for combining an arbitrary number of noisy packets", IEEE Transactions on Communications, Col. COM-33, pages 385 to 393, May 1985).
  • These combined values are stored in the soft buffers of respective HARQ processes.
  • Packet scheduling may be a radio resource management algorithm used for allocating transmission opportunities and transmission formats to the users admitted to a shared medium. Scheduling may be used in packet based mobile radio networks in combination with adaptive modulation and coding to maximize throughput/capacity by e.g. allocating transmission opportunities to the users in favorable channel conditions.
  • the packet data service in UMTS may be applicable for the interactive and background traffic classes, though it may also be used for streaming services. Traffic belonging to the interactive and background classes is treated as non real time (NRT) traffic and is controlled by the packet scheduler.
  • NRT non real time
  • the packet scheduling methodologies can be characterized by:
  • the packet scheduler for uplink is distributed between Radio Network Controller (RNC) and user equipment in 3GPP UMTS R99/R4/R5.
  • RNC Radio Network Controller
  • the air interface resource to be shared by different users is the total received power at a Node B, and consequently the task of the scheduler is to allocate the power among the user equipment(s).
  • the RNC controls the maximum rate/power a user equipment is allowed to transmit during uplink transmission by allocating a set of different transport formats (modulation scheme, code rate, etc.) to each user equipment.
  • the establishment and reconfiguration of such a TFCS may be accomplished using Radio Resource Control (RRC) messaging between RNC and user equipment.
  • RRC Radio Resource Control
  • the user equipment is allowed to autonomously choose among the allocated transport format combinations based on its own status e.g. available power and buffer status.
  • the scheduler may e.g. operate on transmission time interval basis.
  • UMTS Universal Mobile Telecommunication System
  • Fig. 1 The high level R99/4/5 architecture of Universal Mobile Telecommunication System (UMTS) is shown in Fig. 1 (see 3GPP TR 25.401: "UTRAN Overall Description", available from http://www.3gpp.org).
  • the network elements are functionally grouped into the Core Network (CN) 101, the UMTS Terrestrial Radio Access Network (UTRAN) 102 and the User Equipment (UE) 103.
  • the UTRAN 102 is responsible for handling all radio-related functionality, while the CN 101 is responsible for routing calls and data connections to external networks.
  • the interconnections of these network elements are defined by open interfaces (Iu, Uu). It should be noted that UMTS system is modular and it is therefore possible to have several network elements of the same type.
  • Fig. 2 illustrates the current architecture of UTRAN.
  • a number of Radio Network Controllers (RNCs) 201, 202 are connected to the CN 101.
  • Each RNC 201, 202 controls one or several base stations (Node Bs) 203, 204, 205, 206, which in turn communicate with the user equipments.
  • An RNC controlling several base stations is called Controlling RNC (C-RNC) for these base stations.
  • C-RNC Controlling RNC
  • a set of controlled base stations accompanied by their C-RNC is referred to as Radio Network Subsystem (RNS) 207, 208.
  • RNS Radio Network Subsystem
  • S-RNS Serving RNS
  • the Drift RNS 302 (D-RNS) 302 supports the Serving RNS (S-RNS) 301 by providing radio resources as shown in Fig. 3. Respective RNCs are called Serving RNC (S-RNC) and Drift RNC (D-RNC). It is also possible and often the case that C-RNC and D-RNC are identical and therefore abbreviations S-RNC or RNC are used.
  • E-DCH Enhanced Uplink Dedicated Channel
  • Uplink enhancements for Dedicated Transport Channels are currently studied by the 3GPP Technical Specification Group RAN (see 3GPP TR 25.896: "Feasibility Study for Enhanced Uplink for UTRA FDD (Release 6)", available at http://www.3gpp.org). Since the use of IP-based services become more important, there is an increasing demand to improve the coverage and throughput of the RAN as well as to reduce the delay of the uplink dedicated transport channels. Streaming, interactive and background services could benefit from this enhanced uplink.
  • AMC adaptive modulation and coding schemes
  • Node B controlled scheduling is capable of better controlling the uplink interference and smoothing the noise rise variance by allocating higher data rates quickly when the uplink load decreases and respectively by restricting the uplink data rates when the uplink load increases.
  • the coverage and cell throughput may be improved by a better control of the uplink interference.
  • Hybrid ARQ which was one of the key technologies in HSDPA, is also considered for the enhanced uplink dedicated channel.
  • the Hybrid ARQ protocol between a Node B and a user equipment allows for rapid retransmissions of erroneously received data units, and may thus reduce the number of RLC (Radio Link Control) retransmissions and the associated delays. This may improve the quality of service experienced by the end user.
  • RLC Radio Link Control
  • MAC-eu a new MAC sub-layer which will be called MAC-eu in the following (see 3GPP TSG RAN WG1, meeting #31, Tdoc R01-030284, "Scheduled and Autonomous Mode Operation for the Enhanced Uplink").
  • the entities of this new sub-layer may be located in user equipment and Node B.
  • the MAC-eu performs the new task of multiplexing upper layer data (e.g. MAC-d) data into the new enhanced transport channels and operating HARQ protocol transmitting entities.
  • Fig. 4 shows the exemplary overall E-DCH MAC architecture on user equipment side.
  • a new MAC functional entity, the MAC-eu 503, is added to the MAC architecture of Rel/99/4/5.
  • the MAC-eu 503 entity is depicted in more detail in Fig. 5.
  • MAC-d There are M different data flows (MAC-d) carrying data packets to be transmitted from user equipment to Node B. These data flows can have different QoS (Quality of Service), e.g. delay and error requirements, and may require different configurations of HARQ instances. Therefore the data packets can be stored in different Priority Queues.
  • QoS Quality of Service
  • the set of HARQ transmitting and receiving entities, located in user equipment and Node B respectively will be referred to as HARQ process.
  • the scheduler will consider QoS parameters in allocating HARQ processes to different priority queues.
  • MAC-eu entity receives scheduling information from Node B (network side) via Layer 1 signaling.
  • the MAC-eu entities in the E-DCH MAC Architecture at the UTRAN side may be distributed across Node B (MAC-eub) and S-RNC (MAC-eur).
  • the scheduler in Node B chooses the active users and performs rate control by determining and signaling a commanded rate, suggested rate or TFC (Transport Format Combination) threshold that limits the active user (UE) to a subset of the TCFS (Transport Format Combination Set) allowed for transmission.
  • TFC Transport Format Combination
  • Every MAC-eu entity corresponds to a user (UE).
  • UE user
  • the Node B MAC-eu architecture is depicted in more detail. It can be noted that each HARQ Receiver entity is assigned certain amount or area of the soft buffer memory for combining the bits of the packets from outstanding retransmissions.
  • the reordering buffer provides the in-sequence delivery to upper layer.
  • the reordering buffer resides in S-RNC during soft handover (see 3GPP TSG RAN WG 1, meeting #31: "HARQ Structure", Tdoc R1-030247, available of http://www.3gpp.org).
  • 3GPP TSG RAN WG 1 meeting #31: "HARQ Structure", Tdoc R1-030247, available of http://www.3gpp.org.
  • the S-RNC MAC-eu architecture which comprises the reordering buffer of the corresponding user (UE) is shown.
  • the number of reordering buffers is equal to the number of data flows in the corresponding MAC-eu entity on user equipment side.
  • Data and control information is sent from all Node Bs within Active Set to S-RNC during soft handover.
  • the required soft buffer size depends on the used HARQ scheme, e.g. an HARQ scheme using incremental redundancy (IR) requires more soft buffer than one with chase combining (CC).
  • IR incremental redundancy
  • CC chase combining
  • E-DCH associated control signaling required for the operation of a particular scheme consists of uplink and downlink signaling.
  • the signaling depends on uplink enhancements being considered.
  • Node B controlled scheduling e.g. Node B controlled time and rate scheduling
  • user equipment has to send some request message on the uplink for transmitting data to the Node B.
  • the request message may contain status information of a user equipment e.g. buffer status, power status, channel quality estimate.
  • the request message is in the following referred to as Scheduling Information (SI).
  • SI Scheduling Information
  • a Node B can estimate the noise rise and schedule the UE.
  • SA Scheduling Assignment
  • the uplink user equipment has to signal Node B with a rate indicator message information that is necessary to decode the transmitted packets correctly, e.g. transport block size (TBS), modulation and coding scheme (MCS) level, etc.
  • a rate indicator message information that is necessary to decode the transmitted packets correctly, e.g. transport block size (TBS), modulation and coding scheme (MCS) level, etc.
  • MCS modulation and coding scheme
  • HARQ related control information e.g. Hybrid ARQ process number, HARQ sequence number referred to as New Data Indicator (NDI) for UMTS Rel. 5, Redundancy version (RV), Rate matching parameters etc.
  • the Node B After reception and decoding of transmitted packets on enhanced uplink dedicated channel (E-DCH) the Node B has to inform the user equipment if transmission was successful by respectively sending ACK/NAK in the downlink.
  • E-DCH enhanced uplink dedicated channel
  • Node B controlled scheduling is one of the technical features for E-DCH which is foreseen to enable more efficient use of the uplink power resource in order to provide a higher cell throughput in the uplink and to increase the coverage.
  • the term "Node B controlled scheduling" denotes the possibility for the Node B to control, within the limits set by the RNC, the set of TFCs from which the UE may choose a suitable TFC.
  • the set of TFCs from which the UE may choose autonomously a TFC is in the following referred to as "Node B controlled TFC subset".
  • Node B controlled TFC subset is a subset of the TFCS configured by RNC as seen in Fig. 8.
  • the UE selects a suitable TFC from the "Node B controlled TFC subset" employing the Rel5 TFC selection algorithm. Any TFC in the "Node B controlled TFC subset" might be selected by the UE, provided there is sufficient power margin, sufficient data available and TFC is not in the blocked state.
  • the principle of this scheduling approach is to allow Node B to control and restrict the transport format combination selection of the user equipment by fast TFCS restriction control.
  • a Node B may expand/reduce the "Node B controlled subset", which user equipment can choose autonomously on suitable transport format combination from, by Layer-1 signaling.
  • Node B controlled rate scheduling all uplink transmissions may occur in parallel but at a rate low enough such that the noise rise threshold at the Node B is not exceeded. Hence, transmissions from different user equipments may overlap in time. With Rate scheduling a Node B can only restrict the uplink TFCS but does not have any control of the time when UEs are transmitting data on the E-DCH.
  • a Rate Request may be sent in the uplink by the user equipment to the Node B. With the RR the user equipment can request the Node B to expand/reduce the "Node controlled TFC Subset" by one step. Further, a Rate Grant (RG) may be sent in the downlink by the Node B to the user equipment. Using the RG, the Node B may change the "Node B controlled TFC Subset", e.g. by sending up/down commands. The new "Node B controlled TFC Subset" is valid until the next time it is updated.
  • RR Rate Request
  • RG Rate Grant
  • Node B controlled time and rate scheduling The basic principle of Node B controlled time and rate scheduling is to allow (theoretically only) a subset of the user equipments to transmit at a given time, such that the desired total noise rise at the Node B is not exceeded.
  • a Node B may update the transport format combination subset to any allowed value through explicit signaling, e.g. by sending a TFCS indicator (which could be a pointer).
  • a Node B may set the start time and the validity period a user equipment is allowed to transmit. Updates of the "Node B controlled TFC Subsets" for different user equipments may be coordinated by the scheduler in order to avoid transmissions from multiple user equipments overlapping in time to the extent possible.
  • simultaneous transmissions always interfere with each other. Therefore by controlling the number of user equipments, transmitting simultaneously data on the E-DCH, Node B may have more precise control of the uplink interference level in the cell.
  • the Node B scheduler may decide which user equipments are allowed to transmit and the corresponding TFCS indicator on a per transmission time interval (TTI) basis based on, for example, buffer status of the user equipment, power status of the user equipment and available interference Rise over Thermal (RoT) margin at the Node B.
  • TTI transmission time interval
  • RoT Rise over Thermal
  • a Scheduling Information Update may be sent in the uplink by the user equipment to the Node B. If user equipment finds a need for sending scheduling request to Node B (for example new data occurs in user equipment buffer), a user equipment may transmit required scheduling information. With this scheduling information the user equipment provides Node B information on its status, for example its buffer occupancy and available transmit power.
  • SI Scheduling Information Update
  • a Scheduling assignment may be transmitted in the downlink from a Node B to a user equipment.
  • the Node B may schedule a user equipment based on the scheduling information (SI) and parameters like available RoT margin at the Node B.
  • SI scheduling information
  • the Node B may signal the TFCS indicator and subsequent transmission start time and validity period to be used by the user equipment.
  • Node B controlled time and rate scheduling provides a more precise RoT control compared to the rate-only controlled scheduling as already mentioned before.
  • this more precise control of the interference at this Node B is obtained at the cost of more signaling overhead and scheduling delay (scheduling request and scheduling assignment messages) compared to rate control scheduling.
  • Fig. 9 a general scheduling procedure with Node B controlled time and rate scheduling is shown.
  • a user equipment wants to be scheduled for transmission of data on E-DCH it first sends a scheduling request to Node B.
  • T prop denotes here the propagation time on the air interface.
  • the contents of this scheduling request are information (scheduling information) for example buffer status and power status of the user equipment.
  • the Node B may process the obtained information and determine the scheduling assignment. The scheduling will require the processing time T schedule .
  • the scheduling assignment which comprises the TFCS indicator and the corresponding transmission start time and validity period, may be then transmitted in the downlink to the user equipment. After receiving the scheduling assignment the user equipment will start transmission on E-DCH in the assigned transmission time interval.
  • rate scheduling or time and rate scheduling may be restricted by the available power as the E-DCH will have to co-exist with a mix of other transmissions by the user equipments in the uplink.
  • the co-existence of the different scheduling modes may provide flexibility in serving different traffic types. For example, traffic with small amount of data and/or higher priority such as TCP ACK/NACK may be sent using only a rate control mode with autonomous transmissions compared to using time and rate-control scheduling. The former would involve lower latency and lower signaling overhead.
  • Node B controlled Hybrid ARQ may allow rapid retransmissions of erroneously received data packets. Fast retransmissions between a user equipment and a Node B may reduce the number of higher layer retransmissions and the associated delays, thus the quality perceived by the end user may be improved.
  • a protocol structure with multiple stop-and-wait (SAW) Hybrid ARQ processes can be used for E-DCH, similar to the scheme employed for the downlink HS-DSCH in HSDPA, but with appropriate modifications motivated by the differences between uplink and downlink (see 3GPP TR 25.896).
  • SAW stop-and-wait
  • An N-channel SAW scheme consists of N parallel HARQ process, each process works as a stop-and-wait retransmission protocols, which corresponds to a selective repeat ARQ (SR) with window size 1. It is assumed that user equipment can only transmit data on a single HARQ process each transmission time interval.
  • SR selective repeat ARQ
  • a user equipment is transmitting data packet 1 on E-DCH on the uplink to the Node B.
  • the transmission is carried out on the first HARQ process.
  • the Node B After propagation delay of the air interface T prop the Node B receives the packet and starts demodulating and decoding. Depending on whether the decoding was successful an ACK/NACK is sent in the downlink to the user equipment.
  • Node B sends an ACK after T NBprocess , which denotes the time required for decoding and processing the received packet in Node B, to the user equipment. Based on the feedback on the downlink the user equipment decides whether it resends the data packet or transmits a new data packet.
  • T UEprocess The processing time available for the user equipment between receiving the ACKnowledgement and transmitting the next transmission time interval in the same HARQ process.
  • the round trip time denotes the time between transmission of a data packet in the uplink and sending a retransmission of that packet or a new data packet upon receiving the ACK/NACK feedback for that packet.
  • RTT round trip time
  • a retransmission protocol with asynchronous data transmission uses an explicit signaling to identify a data block or the HARQ process, whereas in a protocol with synchronous data transmission, a data block or HARQ process is identified based on the time point a data block is received.
  • a UE may for example have to signal the HARQ process number explicitly in a protocol with asynchronous data transmission in order to ensure correct soft combining of data packets in case of a retransmission.
  • the advantage of a HARQ retransmission protocol with asynchronous data transmission is the flexibility, which is given to the system.
  • the Node B scheduler may for example assign UEs a time period and HARQ processes for the transmission of data on the E-DCH based on the interference situation in the cell and further parameters like priority or QoS parameters of the corresponding E-DCH service.
  • a retransmission protocol with asynchronous HARQ feedback information uses sequence numbers (SN) or other explicit identification of the feedback messages whereas protocols with synchronous HARQ feedback information identifies the feedback messages based on the time when they are received, as for example in HSDPA.
  • Feedback may sent on the HS-DPCCH after a certain time instant upon having received the HS-DSCH (see 3GPP TR 25.848: "Physical Layer Aspects of High Speed Downlink Packet Access", version 5.0.0, available at http://www.3gpp.org).
  • a retransmission protocol with asynchronous data transmission may enable a Node B to have more scheduling flexibility.
  • the scheduling assignment may for example be based on the scheduling information sent from a UE and the interference situation in the cell.
  • the different scheduling approaches considering retransmissions have to be taken into account, in order to enable further control of the uplink interference by the Node B scheduler (see e.g. 3GPP TSG TAN WG1#35: "Relationship between scheduling and HARQ", Tdoc R1-031224, available at http://www.3gpp.org).
  • a retransmission protocol with asynchronous uplink but synchronous retransmissions as described in the copending European application by the applicant "HARQ Protocol with Synchronous Retransmissions" is one approach, which may allow the scheduler more control on the noise rise in the cell.
  • the transmission of new data packets on an E-DCH is sent in an asynchronous manner in order to keep the advantage of scheduling flexibility, though retransmissions are sent after a predefined time instant upon having received the NACK.
  • the advantages of a retransmission protocol with synchronous retransmissions may also depend on the scheduling mode used.
  • Node B may only be controlling the TFCS and the UE can choose among an appropriate TFC for the uplink transmissions.
  • Node B may not have control on the UEs transmission time. There may also not be restrictions on the retransmission timing for the UE.
  • a Node B may exactly know when the retransmissions are sent by UE, and may thus reserve uplink resources. The latter may enable the Node B to more precisely control the uplink interference in the cell.
  • Node B schedules the initial transmission of a data packet as well as the retransmissions related thereto. In case retransmissions are sent in a synchronous manner, the Node B may not need to schedule the retransmissions, which reduces the signaling overhead and the processing time for the scheduler in the Node B significantly.
  • Fig. 11 a transmission on E-DCH in time and rate controlled scheduling mode is shown. The retransmission is sent T sync after having received the NACK. Thus, the UE does not need to monitor the grant channel for a scheduling assignment (SA) for the retransmission.
  • SA scheduling assignment
  • a Node B may assign transmission resources to other UEs instead of scheduling the pending retransmissions.
  • the UEs may increase the power for retransmissions as a result of the high interference in the cell in order to send the packet successfully. This will cause a further increase of the uplink noise rise.
  • CDMA Code Division Multiple Access
  • the object of the present invention is to provide a timing control for data retransmissions in order to overcome at least one of the before mentioned problems.
  • the problem of synchronous retransmissions in interference critical situations may be mitigated by means of additional feedback from Node B sent in the downlink to the UE.
  • This feedback information on the scheduling of retransmission may be combined with the HARQ feedback information.
  • a method for controlling the transmission timing of data retransmissions in a wireless communication system is provided.
  • a HARQ protocol is used to retransmit data from a transmitting entity to a receiving entity via a data channel.
  • the receiving entity may receive a data packet from the transmitting entity, and may determine whether the data packet has been successfully received. For example, in interference critical situations within a cell, it is likely that a high number of data packets from different UEs are not successfully received. If these UEs would perform synchronous retransmissions a comparable high interference level in the cell would be the result at the time the retransmissions are transmitted.
  • the receiving entity may further determine whether the interference level is above or equal to a predetermined threshold interference level. For example, the uplink interference level may be measured. According to a further embodiment, also the number of expected retransmissions may be taken as a measure for deciding whether to halt the retransmission process and to transmit the retransmission data packet at a later predefined point of time or whether to continue with their synchronous retransmission.
  • the receiving entity may generate a feedback message, wherein the feedback message indicates to the transmitting entity to transmit a retransmission data packet for said received data packet after a first predetermined time span upon having received said feedback message (synchronous retransmission), if the determined interference level is below the predetermined threshold interference level.
  • the feedback message indicates to the transmitting entity to transmit a retransmission data packet for said received data packet after a second predetermined time span upon having received said feedback message.
  • the second time span is larger than the first time span.
  • the receiving entity may also indicate to the transmitting entity in the feedback message that no synchronous retransmission should be performed for unsuccessfully received data packet at all in interference critical situations, but to abort the retransmission.
  • a scheduling request may be transmitted by the transmitting entity to the receiving with arbitrary delay which may be larger than the second predetermined time interval mentioned above.
  • the scheduling request may be used for requesting resources for the transmission of a retransmission data packet for the unsuccessfully received data packet. This may be especially applicable in the time and rate controlled scheduling mode. E.g. when operated in the rate controlled scheduling mode the transmitting entity may perform an autonomous retransmission with arbitrary delay which may be larger than second predetermined time interval mentioned above.
  • the provision of synchronous retransmissions may be aborted if an interference critical situation within the cell exists and - e.g. - a scheduling of the retransmission data may be performed instead when operated in a time and rate controlled scheduling mode. Which retransmission timing should be used is indicated in the feedback provided by the receiving entity.
  • a retransmission data packet may be a retransmission of the received data packet or may only comprise information providing a higher level of redundancy to the previously unsuccessfully received data packet, such that decoding may be possible after soft combining one or more retransmission data packets with the received data packet.
  • the receiving entity may schedule data transmissions of a plurality of transmitting entities comprising the transmitting entity, and may stop the scheduling of data transmissions from the plurality of transmitting entities, if the interference level is above or equal the predetermined threshold interference level.
  • This embodiment may be especially applicable for a time and rate controlled scheduling mode for the transmitting entity.
  • the scheduling by the receiving entity may be continued.
  • the receiving entity may use a similar mechanism to reduce uplink interference.
  • the receiving entity may control a transmission format combination subset of the transmitting entity, wherein the transmission format combination determines - among other attributes - the amount of data the transmitting entity is allowed to transmit, and may restrict the transmission format combination subset of the transmitting entity, if the determined interference level is above or equal to the predetermined threshold interference level.
  • This embodiment may be especially suited for transmissions in the rate controlled scheduling mode.
  • a common rate control message may be transmitted from the receiving entity to a plurality of transmitting entities comprising the transmitting entity, wherein the common rate control message restricts the transmission format combination subsets of each of the plurality of transmitting entities, thus restricting the maximum data rate to a data rate common to the plurality of transmitting entities for autonomous transmissions.
  • the additional information introduced to the feedback message by taking into account the interference level may be combined with the HARQ feedback (ACK/NACK).
  • ACK/NACK HARQ feedback
  • ACK/NACK HARQ feedback
  • a different code word for the HARQ feedback could be used, where the new feedback format NACK-H is encompassed (see for example table below).
  • the combined feedback could also be combined with other signaling information, for example scheduling control signaling.
  • other signaling information for example scheduling control signaling.
  • the combined feedback and the other signaling information may be encoded together.
  • Another alternative may be to signal the additional feedback on a different OVSF code i.e. channel, than the HARQ feedback (ACK/NACK)
  • feedback messages indicating the successful or the unsuccessful reception of a data packet may be transmitted via one control channel. Further, the information in the feedback messages may be combined with scheduling related control information and may be jointly encoded.
  • a further embodiment of the present invention proposes the use of different spreading codes, e.g. OVSF codes, for spreading negative feedback messages depending on the interference level in a cell.
  • the feedback message may be spread using different OVSF codes in response to the feedback timing indicated by the feedback message.
  • the additional feedback message (NACK-H) indicating a retransmission after the second time interval (or indicating to abort retransmission) may be signaled using a different spreading code, e.g. OVSF code, than the HARQ protocol feedback information (ACK, NACK).
  • a further embodiment of the present invention provides a method for controlling the transmission timing of data retransmissions in a wireless communication system.
  • the communication system uses a HARQ protocol to retransmit data from a transmitting entity to a receiving entity via a data channel.
  • the transmitting entity may transmit a data packet to the receiving entity, and may receive a feedback message for the transmitted data packet from the receiving entity.
  • the feedback message may indicate whether to the transmitting entity to transmit a retransmission data packet for said transmitted data packet after a first or a second predetermined time span upon having received said feedback message.
  • the second time span may be larger than the first time span.
  • the transmitting entity may transmit a retransmission data packet to said receiving entity after the first or the second predetermined time span upon having received said feedback message in response to said feedback message, i.e. dependent on the indication in said feedback message indicating the unsuccessful reception of the initially transmitted data packet, its retransmission is either transmitted upon elapse of the first or the second predetermined time period.
  • the transmitting entity may receive via the scheduling related control channel a common rate control message.
  • the common rate control message may be used to restrict the transmission format combination subsets of each of a plurality of transmitting entities comprising said transmitting entity to a transmission format combination subset allowing a maximum data rate for autonomous transmission common to the plurality of transmitting entities.
  • the transmitting entity may recognize that the interference level in the cell is critical. Thus, it may not be allowed to transmit - e.g. for a predetermined time interval - data or scheduling requests to the receiving entity autonomously in order to not unnecessarily further contribute to the cell's noise rise. I.e. only when granted resources from the receiving entity and in response to receiving a feedback message indicating to transmit a retransmission data packet for said received data packet after a second predetermined time span upon having received said feedback message, data packets and/or retransmission data packets may be only transmitted by the transmitting entity.
  • the present invention provides a base station in a wireless communication system using a HARQ protocol to retransmit data from a mobile terminal to the base station via a data channel.
  • the base station may comprise receiving means for receiving a data packet from the transmitting entity and processing means for determining whether the data packet has been successfully received, wherein the processing means is adapted to determine whether the interference level is above or equal to a predetermined threshold interference level, if it has been determined that the data packet has not been successfully received.
  • the base station may be provided with feedback message generation means for generating a feedback message, wherein the feedback message indicates to the transmitting entity to transmit a retransmission data packet for said received data packet after a first predetermined time span upon having received said feedback message, if the determined interference level is below the predetermined threshold interference level. If the determined interference level is above or equal to the predetermined threshold interference level, the feedback message indicates to the transmitting entity to transmit a retransmission data packet for said received data packet after a second predetermined time span upon having received said feedback message or to abort the retransmission. For example the second time span may be larger than the first time span.
  • the base station may comprise transmitting means for transmitting the feedback message to the transmitting entity.
  • a base station adapted to perform the method according to the embodiments outlined above in relation to the receiving entity is provided.
  • the mobile terminal may comprise transmitting means for transmitting a data packet to the receiving entity, and receiving means for receiving a feedback message for the transmitted data packet from the receiving entity, wherein the feedback message indicates whether to the transmitting entity to transmit a retransmission data packet for said transmitted data packet after a first or a second predetermined time span upon having received said feedback message or to abort the retransmission.
  • the transmission means may be adapted to transmit a retransmission data packet to said receiving entity after the first or the second predetermined time span upon having received said feedback message in response to said feedback message.
  • a mobile terminal adapted to perform the method according to the embodiments outlined above in relation to the transmitting entity is provided.
  • a wireless communication system using a HARQ protocol to retransmit data from a mobile terminal to the base station via a data channel is provided.
  • the system may comprise at least one base station and at least one mobile terminal described above.
  • the problem of synchronous retransmissions in interference critical situations may be mitigated by means of additional feedback from Node B sent in the downlink to the UE.
  • the new feedback information NACK-H(alt) may be signaled in the downlink from the Node B to the UE when a data packet is received incorrectly at the Node B and the uplink interference is at a critical level, i.e. larger than a predetermined threshold interference level.
  • a NACK-H indicates to the UE not to transmit the retransmission of the packet after the defined time T sync upon having received a negative feedback such as NACK (synchronous retransmission), but to wait an additional predefined time before retransmitting the packet.
  • the Node B may decide to signal a NACK-H to the UE on the downlink.
  • the information in this feedback message indicates to the UE to postpone the retransmission of the previously sent packet to a later predefined point of time than the point in time at which retransmissions are usually sent when employing synchronous retransmissions.
  • the Node B may stop scheduling of UEs for new data transmission on E-DCH when scheduling is performed in a time and rate controlled mode until the noise rise situation in cell allows for new data traffic.
  • the Node B may for example restrict the "Node B controlled TFC Subset" for the rate controlled scheduling mode in addition, in order to limit the uplink interference caused by autonomous UE transmissions. This may be for example done by a common rate control message, which reduces the TFCS for all UEs in the cell. Thus the maximum data rate a UE is allowed to transmit data autonomously is restricted for all UEs in the cell.
  • the packet shall be retransmitted at a later predefined point time as outlined above.
  • T Halt may be larger than T sync .
  • T sync may be kept as small as possible.
  • the feedback information NACK-H may indicate to the UE that the uplink interference situation in the cell is critical. Therefore the UE may not be allowed to transmit data on E-DCH autonomously when scheduling is performed in a rate controlled mode or to transmit scheduling requests for a predefined time period to avoid additional uplink traffic.
  • NACK-H related signaling according to an embodiment of the present invention is shown.
  • the retransmission is sent T Halt upon having received the NACK-H.
  • T sync denotes the time, after which the synchronous retransmission would have been taken place.
  • the time period T Halt is larger than the time period T sync after which the retransmission would be usually transmitted when using synchronous transmission of feedback.
  • Both time periods T sync and T Halt are used to define a point in time after the reception of the negative feedback, i.e. NACK for T sync and NACK-H for T Halt , delayed by the time period T sync and T Halt respectively.
  • ACKnowledgments ACKnowledgments
  • NACK Negative ACKnowledgments
  • One possibility to encode a 1 bit acknowledgement indication is repetition coding, for example 10 copies of the indication bit.
  • Introducing a third level for NACK-H may decrease the reliability of the feedback information.
  • OVSF Orthogonal Variable Spreading Factor
  • Another realization of this scheme may use a different code word for the ACK/NACK signal instead of using simple repetition.
  • An example of using the code word of the ACK/NACK signaling with the additional NACK-H signal is shown in the table below.
  • control information may also be possible to send the ACK/NACK-H/NACK feedback simultaneously with further control signaling in the downlink, e.g. scheduling related control signaling.
  • control information could be encoded together.
  • Error correction codes like turbo codes or convolutional codes, may be applied for the encoding of the control information.
  • a NACK-H may indicate to the UE to abort the retransmission.
  • the data packet is not retransmitted at the later predefined point of time (T Halt ).
  • T Halt the later predefined point of time
  • UE may autonomously transmit the data packet again at a later point of time.
  • the UE may need to transmit a scheduling request for the transmission first and the Node B may in response schedule the transmission of this data packet again.
  • Fig. 13 shows a flow chart for controlling the timing of retransmissions according to an embodiment of the present invention.
  • a mobile terminal transmits a data packet to a Node B.
  • the Node B receives the data packet in step 1302 and determines in step 1303, whether the data packet has been successfully received.
  • the Node B may generate and transmit an acknowledgment ACK in step 1304 to inform the mobile terminal on the successful reception.
  • the Node B determines in step 1305 whether the current interference level in its cell is above or equal to a predetermined threshold interference level, i.e. whether an interference critical situation within the cell is present. If the interference level is below the threshold, the Node B may transmit a NACK to the mobile terminal in step 1306 to indicate the unsuccessful reception of the packet and to request a synchronous retransmission of the data packet.
  • a predetermined threshold interference level i.e. whether an interference critical situation within the cell is present. If the interference level is below the threshold, the Node B may transmit a NACK to the mobile terminal in step 1306 to indicate the unsuccessful reception of the packet and to request a synchronous retransmission of the data packet.
  • Node B determines in step 1305 that the interference level in the cell is above or equal to the threshold, a NACK-H is generated and transmitted to the mobile terminal in step 1307.
  • the NACK-H indicates an unsuccessful reception of a data packet to the mobile terminal and instructs same to extend the time period after which a retransmission is issued upon receiving the feedback.
  • the mobile terminal may determine in step 1309 which type of feedback was sent by the Node B. In case the data packet has been successfully received at the Node B an ACK is received and the mobile terminal may continue to transmit the next data packet to the Node B in step 1310.
  • the Node B In case the data packet was not successfully received and the interference level in the Node B's cell has been acceptable, the Node B issued a NACK. In case the mobile terminal determined that a NACK has been received, it continues by sending a retransmission data packet after expiry of a first predetermined time period upon having received the feedback, i.e. provided synchronous retransmissions in step 1311.
  • the Node B If the data packet was not successfully received and the interference level in the Node B's cell has not been acceptable, the Node B issued a NACK-H. In this case the mobile terminal may transmit a retransmission data packet after expiry of a second predetermined time period upon having received the feedback in step 1312. As for example shown in Fig. 12, the second time period T Halt is of longer duration than the first time period T Sync .
  • dotted arrows in the figure are intended to indicate the transmission of data packets or feedback messages between the mobile terminal and the Node B and point to the blocks in which same are processed and/or interpreted.
  • the present invention may be especially applicable when a HARQ retransmissions protocol with synchronous retransmissions is assumed. Further, the present invention is especially applicable to HARQ Type II and Type III, i.e. HARQ protocols using soft combining of data packets and retransmissions.
  • the present invention may employed independent of the underlying access network structure, e.g. the Evolved UTRAN architecture or the Release 99/4/5 UTRAN architecture.
  • the present invention is especially applicable to being employed in data transmissions on an E-DCH according to an embodiment of the present invention.

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  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Control Of Eletrric Generators (AREA)
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EP04001395A 2004-01-22 2004-01-22 Verfahren zur HARQ-Wiederholungszeitsteuerung Expired - Lifetime EP1557967B1 (de)

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AT04001395T ATE390773T1 (de) 2004-01-22 2004-01-22 Verfahren zur harq-wiederholungszeitsteuerung
EP04001395A EP1557967B1 (de) 2004-01-22 2004-01-22 Verfahren zur HARQ-Wiederholungszeitsteuerung
DE602004012702T DE602004012702T2 (de) 2004-01-22 2004-01-22 Verfahren zur HARQ-Wiederholungszeitsteuerung
CNA2005800069148A CN1926795A (zh) 2004-01-22 2005-01-10 混合自动重复请求重新传输时序控制方法
PCT/EP2005/000145 WO2005071875A1 (en) 2004-01-22 2005-01-10 Method of harq retransmission timing control
US10/586,736 US20070183451A1 (en) 2004-01-22 2005-01-10 Method of harq retransmission timing control
KR1020067016817A KR20070006748A (ko) 2004-01-22 2005-01-10 Ｈａｒｑ 재송신 타이밍 제어 방법
MXPA06008357A MXPA06008357A (es) 2004-01-22 2005-01-10 Metodo de control de sincronizacion de retransmision de solicitud de repeticion automatica hibrida.
JP2006549957A JP2007523529A (ja) 2004-01-22 2005-01-10 データパケット送信方法、データパケット受信方法、データパケット送受信方法、移動端末、基地局および無線通信システム
JP2006348524A JP2007166642A (ja) 2004-01-22 2006-12-25 データ再送の送信タイミングを制御する方法、基地局、移動端末および無線通信システム

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